Topic: One pipe not warming up the same as others! CB650

[raiken1]

I just finished most of my tune-up/rebuild of my 1981 CB650 and have started having a new issue. It seems like one issue goes away and a new one starts. Previously the bike would idle well and then when given throttle it would hand at high rpm. All 4 pipes were heating up the same amount. I decided to take the advancer out and clean it then lube it with engine oil. I reinstalled it and put the timing back where it was before. Now, the bike will not take any amount of throttle without dying. The header on Cylinder 1 is only getting warm after 3-5 minutes of idling as well. I pulled the plug and it arcs off the engine head. I still need to do a leak test and carb sync, which were next, but this cylinder 1 issue has started. What should I look at next?

Here is what I have done thus far:

-Professional carb rebuild bike a vintage bike shop- Ultrasonic bath, pilot jets cleaned with guitar string, new seals and other jets etc are new (All parts from K&L carb rebuild kits) - Stock jet sizing 120 mains - Carbs were bench synced
-Brand new Vacuum tees between 1-2 and 3-4
-Rebuild kit for accelerator pump
-New Carb boots
-New Plugs and wires
-Set pulser gap to .3mm
-Set valve clearances
-New filter (I have a stock paper filter and a uni foam filter) - original airbox
-Mac 4 into 1 exhaust with megaphone muffler (Original exhaust was rusted)
-Checked static timing
-New fuel filter (Although testing without it - Auxiliary fuel container)
-Cleaned inside of fuel tank
-Set mixture screws to 1.5 turns out
- Lubed and cleaned advancer
-Oil change

[bender01]

Rap that carb with a screwdriver handle! Sticking float? Pull the float bowl drain screw and see if fuel is coming out.

[Gene]

Yep - start with the easy stuff ^^^

Make sure you have fuel in that carb.

[raiken1]

Thanks for the replies! I will tap the carb with something plastic and drain the fuel. Will update once I’m done. I have to clean up some spark plug threads first today.